Improvement in the manufacture of white lead to collect the dust



M. TULLE. Manufacture of White-Lead to Collect the Dust.

Patented Septembei'2,1873.

Inventor:

Witnesses:

Attorneys.

UNITED I STATES PATENT DFFI E.

MIGAIAH TOLLE, OF ST. LOUIS, MISSOURI.

IMPROVEMENT IN THE MANUFACTURE OF WHlTE LEAD TO COLLECT THE DUST.

Specification forming part of Letters Patent No. 142,4. [9, datedSeptember 2, 1873; application filed July 12, 1873.

To all whom it may concern:

Be it known that I, MICAIAH TOLLE, of St. Louis, in the county of St.Louis and State of Missouri, have invented a new and Improved Apparatusfor Utilizing Lead-Dust in White- Lead Factories, of which the followingis a specification The accompanying drawing represents a verticallongitudinal section of my improved apparatus for utilizing lead-dust inwhite lead factories.

The object of my invention is to utilize the lead-dust which escapes atpresent in whitelead factories after having passed through the separatorin which the corroded lead has been separated from the uncorroded lead,so that a considerable saving be accomplished,and the health of theworkmen be protected against the deleterious influences of the1ead-dust. My invention consists, principally, in the suitablecombination of an elevator with a casing or spout, through which theuncorroded lead is conducted on the elevator, which is submerged in atank of water, so that the leaddust carried down from the separator isretained therein, and the uncorroded lead carried up'by the elevator.

A in the drawing represents a tank or cistern filled with water, intowhich the lower end of an inclined elevator, B, is submerged.

The elevator B may be constructed in any one of the usual forms, withbelt or chain 0; but may, by preference, be arranged with buckets at,having perforations b, and end ribs or projections d, so that the watermay easily pass through, and the uncorroded lead be carried up in thebuckets. Stationary or adjustable pulleys D, of which the upperis drivenby suitable power, the lower connected to the sides of the tanks, setthe buckets a in motion. Rollers 0 support the upper part of chain 0,and turn in bearin gs of the sides of the upper trough E, which conductsthe water-drippings back into tank A. A similar trough, E,.is alsoarranged below the returning portion of chain 0 for the same purpose.A-casing or spout, F, is connectedto the top of the submerged end ofelevator B, being of the same width, and provided with side openings ftoward the buckets a. Spout'F is placed vertically, or with suitableinclination, on elevator B, and conveys the uncorroded lead down 7 fromthe separator in which the corroded lead has been separated from theuncorroded or metallic lead. The metallic lead carries all the lead-dustdown through the upright spout into tank A, and settles then on thechain or belt at the lower end of the elevator, from which it will betaken up out of the water by the buckets, and conveyed to any suitableplace.

The lead-dust will be retained in the water, and prevented from flyingabout the factory, so that the same is more healthy and pleasant forworkmen. A considerable saving of lead is produced by this absorption ofthe dust, and, also, the adhering corroded lead washed off from theuncorroded lead, so that the latter will afterward, when exposed to theacid for oxidation into white lead, offer less resistance to the same.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is--- The apparatus for utilizing thelead-dust generated in white-lead factories by the separation of thecorroded from the uncorroded lead, consisting of tank A, elevator B,with troughs E E, and spout F, constructed and arranged substantially asand for the purpose described.

Witnesses:

Gno. HENSING. JAMES H. ROBINSON.

MIGAIAH TOLLE.

